AXA data breach affects 5,400 Singapore customers

Referring to the below article on the cyber breach of AXA, this is unbelievable. Although I am not a AXA customer but what will happen to those affected? Better to check the system if there's any backdoor.

Referring to the below article on the cyber breach of AXA, this is unbelievable. Although I am not a AXA customer but what will happen to those affected? Better to check the system if there's any backdoor.